<template>
  <view class="uni-numbox">
    <!-- <view @click="_calcValue('minus')" class="uni-numbox__minus uni-numbox-btns" :style="{ background }"> -->
    <!-- <text class="uni-numbox--text" :class="{ 'uni-numbox--disabled': inputValue <= min || disabled }"
				:style="{ color }">
				-
			</text> -->
    <text
      class="cicon-move-round"
      :class="{
        'uni-numbox--disabled': inputValue <= min || disabled,
        'groupon-btn': activity === 'groupon',
        'seckill-btn': activity === 'seckill',
      }"
      @click="_calcValue('minus')"
    ></text>
    <!-- </view> -->
    <input
      v-model="inputValue"
      :disabled="disabled"
      class="uni-numbox__value"
      type="number"
      :style="{ color }"
      @focus="_onFocus"
      @blur="_onBlur"
    />
    <!-- <view @click="_calcValue('plus')" class="uni-numbox__plus uni-numbox-btns">
			<text class="uni-numbox--text" :class="{ 'uni-numbox--disabled': inputValue >= max || disabled }">+</text>
		</view> -->
    <text
      class="cicon-add-round"
      :class="{
        'uni-numbox--disabled': inputValue >= max || disabled,
        'groupon-btn': activity === 'groupon',
        'seckill-btn': activity === 'seckill',
      }"
      @click="_calcValue('plus')"
    ></text>
  </view>
</template>
<script>
/**
 * NumberBox 数字输入框
 * @description 带加减按钮的数字输入框
 * @tutorial https://ext.dcloud.net.cn/plugin?id=31
 * @property {Number} value 输入框当前值
 * @property {Number} min 最小值
 * @property {Number} max 最大值
 * @property {Number} step 每次点击改变的间隔大小
 * @property {String} background 背景色
 * @property {String} color 字体颜色（前景色）
 * @property {Boolean} disabled = [true|false] 是否为禁用状态
 * @event {Function} change 输入框值改变时触发的事件，参数为输入框当前的 value
 * @event {Function} focus 输入框聚焦时触发的事件，参数为 event 对象
 * @event {Function} blur 输入框失焦时触发的事件，参数为 event 对象
 */

export default {
  name: 'UniNumberBox',
  props: {
    value: {
      type: [Number, String],
      default: 1,
    },
    modelValue: {
      type: [Number, String],
      default: 1,
    },
    min: {
      type: Number,
      default: 0,
    },
    max: {
      type: Number,
      default: 100,
    },
    step: {
      type: Number,
      default: 1,
    },
    background: {
      type: String,
      default: '#f5f5f5',
    },
    color: {
      type: String,
      default: '#333',
    },
    disabled: {
      type: Boolean,
      default: false,
    },
    activity: {
      type: String,
      default: 'none',
    },
  },
  emits: ['change', 'input', 'update:modelValue', 'blur', 'focus'],
  data() {
    return {
      inputValue: 0,
    }
  },
  watch: {
    value(val) {
      this.inputValue = +val
    },
    modelValue(val) {
      this.inputValue = +val
    },
  },
  created() {
    if (this.value === 1) {
      this.inputValue = +this.modelValue
    }
    if (this.modelValue === 1) {
      this.inputValue = +this.value
    }
  },
  methods: {
    _calcValue(type) {
      if (this.disabled) {
        return
      }
      const scale = this._getDecimalScale()
      let value = this.inputValue * scale
      let step = this.step * scale
      if (type === 'minus') {
        value -= step
        if (value < this.min * scale) {
          return
        }
        if (value > this.max * scale) {
          value = this.max * scale
        }
      }

      if (type === 'plus') {
        value += step
        if (value > this.max * scale) {
          return
        }
        if (value < this.min * scale) {
          value = this.min * scale
        }
      }

      this.inputValue = (value / scale).toFixed(String(scale).length - 1)
      this.$emit('change', +this.inputValue)
      // TODO vue2 兼容
      this.$emit('input', +this.inputValue)
      // TODO vue3 兼容
      this.$emit('update:modelValue', +this.inputValue)
    },
    _getDecimalScale() {
      let scale = 1
      // 浮点型
      if (~~this.step !== this.step) {
        scale = Math.pow(10, String(this.step).split('.')[1].length)
      }
      return scale
    },
    _onBlur(event) {
      this.$emit('blur', event)
      let value = event.detail.value
      if (!value) {
        // this.inputValue = 0;
        return
      }
      value = +value
      if (value > this.max) {
        value = this.max
      } else if (value < this.min) {
        value = this.min
      }
      const scale = this._getDecimalScale()
      this.inputValue = value.toFixed(String(scale).length - 1)
      this.$emit('change', +this.inputValue)
      this.$emit('input', +this.inputValue)
    },
    _onFocus(event) {
      this.$emit('focus', event)
    },
  },
}
</script>
<style lang="scss" scoped>
.uni-numbox .uni-numbox--disabled {
  color: #c0c0c0 !important;
  /* #ifdef H5 */
  cursor: not-allowed;
  /* #endif */
}

.uni-numbox {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  align-items: center;
}

.uni-numbox__value {
  width: 74rpx;
  text-align: center;
  font-size: 30rpx;
}

.cicon-move-round {
  font-size: 44rpx;
  color: var(--ui-BG-Main);
}

.cicon-add-round {
  font-size: 44rpx;
  color: var(--ui-BG-Main);
}

.groupon-btn {
  color: #ff6000;
}

.seckill-btn {
  color: #ff5854;
}
</style>
